Anaerobic digestion of residual liquid effluent (brown juice) from a green biorefinery

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Abstract

This work studied the anaerobic digestion of brown juice, a liquid residual stream generated from biomass fractionation in a green biorefinery. Biomethane potential batch tests and inhibition studies of brown juice were performed during continuous processing in an upflow anaerobic sludge blanket reactor. Prolongation of the lag phase in the batch tests with increasing substrate/inoculum ratio suggested initial inhibition, which was, however, overcome by adaptation. This was indicated by high final methane yields, which were close to the theoretical maximum of up to 500 L-CH4 kg-VS−1, achieved after 15 days for most of the set-ups. Reactor operation at the organic loading rate of 13.9 g-COD L−1 day−1 and hydraulic retention time of 3 days revealed methane yields of 202 L-CH4 kg-COD−1 (307 L-CH4 kg-VS−1). Particle size analysis of the granules used in the reactor showed disintegration of the larger granules.
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This work studied the anaerobic digestion of brown juice, a liquid residual stream generated from biomass fractionation in a green biorefinery. Biomethane potential batch tests and inhibition studies of brown juice were performed during continuous processing in an upflow anaerobic sludge blanket reactor. Prolongation of the lag phase in the batch tests with increasing substrate/inoculum ratio suggested initial inhibition, which was, however, overcome by adaptation. This was indicated by high final methane yields, which were close to the theoretical maximum of up to 500 L-CH4 kg-VS−1, achieved after 15 days for most of the set-ups. Reactor operation at the organic loading rate of 13.9 g-COD L−1 day−1 and hydraulic retention time of 3 days revealed methane yields of 202 L-CH4 kg-COD−1 (307 L-CH4 kg-VS−1). Particle size analysis of the granules used in the reactor showed disintegration of the larger granules.
Original languageEnglish
JournalInternational Journal of Environmental Science and Technology
Pages (from-to)1-10
Number of pages11
ISSN1735-1472
DOI
StateE-pub ahead of print - 6 Jan 2018
Publication categoryResearch
Peer-reviewedYes

    Research areas

  • Brown juice, Biochemical methane potential, Upflow anaerobic sludge blanket reactor
ID: 267348872